<tt id="6hsgl"><pre id="6hsgl"><pre id="6hsgl"></pre></pre></tt>
          <nav id="6hsgl"><th id="6hsgl"></th></nav>
          国产免费网站看v片元遮挡,一亚洲一区二区中文字幕,波多野结衣一区二区免费视频,天天色综网,久久综合给合久久狠狠狠,男人的天堂av一二三区,午夜福利看片在线观看,亚洲中文字幕在线无码一区二区

          China is fine with monitoring 'fine' particles

          Updated: 2011-12-09 19:59

          (Xinhua)

            Comments() Print Mail Large Medium  Small 分享按鈕 0

          BEIJING - China's Ministry of Environmental Protection this week announced that its proposal for tighter air-quality monitoring, which includes issuing standards for the much-talked-about "PM2.5" measure, has won overwhelming support in public feedback and that it would take citizens' advice in finalizing the measures.

          In making the announcement, the ministry showed once again that China is responsive to public health concerns.

          Particles less than 2.5 micrometers in diameter (PM2.5) are referred to as "fine" particles and are believed to pose health risks. Because of their small size (less than one-seventh of the average width of a human hair), these fine particles can lodge deeply into the lungs.

          The fine particles have gradually come under the spotlight after media reports pointed out that China's air-quality monitoring has not been considering PM2.5 as a gauge of overall air quality. It is thought this is the reason for the frequent discrepancies between good ratings by government and the actual poor experience of urban Chinese.

          Since then, experts from the ministry have admitted that the rapid growth of the Chinese economy has brought about more air pollution, but the current air standards, which remain unchanged for more than 10 years, are falling behind the changes.

          Improving the air-quality index involves adding standards for ozone density and the revision of standards for other air pollutants, but adding PM2.5 standards is the most important amendment.

          That's because improving the living standards of Chinese people means more cars and more power consumption, both of which contribute to the emission of PM2.5 as sources of fine particles include all types of combustion activities such as motor vehicles and power plants.

          According to the draft, the new air-quality index is scheduled to be fully implemented nationwide in 2016, and the central government may designate certain regions to adopt it ahead of the national deadline.

          In fact, implementing PM2.5 standards is no easy job.

          Firstly, what PM2.5 standards fit China's economic conditions is still in discussion. Indeed, the PM2.5 standards are a relatively recent invention. The world's first such standards were issued by the United States in 1997.

          Moreover, as a multi-source pollutant, PM2.5 is tricky to control technically. Research shows over half of PM2.5 emissions are not directly emitted, but are oxidations of other air pollutants.

          Given these difficulties, China may be racing against time, but it is also comforting to recognize that it is making great strides to meet public health concerns.

          主站蜘蛛池模板: 姑娘故事高清在线观看免费| 国产白嫩护士在线播放| 777久久精品一区二区三区无码 | 亚洲乱色熟女一区二区蜜臀| 精品久久久无码人妻中文字幕| 亚洲av伊人久久青青草原| 国产av一区二区三区久久| 蜜桃无码一区二区三区| 他掀开裙子把舌头伸进去添视频| 国产在线观看播放av| 无码中文字幕加勒比高清| 国产学生裸体无遮挡免费| 小雪被老外黑人撑破了视频| 国产亚洲国产亚洲国产亚洲| 亚洲av免费看一区二区| 亚洲欧洲日产国码高潮αv| 麻花传媒在线观看免费| 欧美日韩国产va在线观看免费 | 最近中文字幕免费手机版| 理论片午午伦夜理片久久| 看国产黄大片在线观看| 国产午夜精品亚洲精品国产| 中文字幕一区二区三区久久蜜桃| 蜜桃视频在线免费观看一区二区| 亚洲精品一区二区口爆| 中文字幕国产精品中文字幕| 91福利国产午夜亚洲精品| 亚洲日韩中文字幕在线播放| 亚洲欧美成人a∨观看| 国产高清在线不卡一区| 日韩视频免费| 国产精品午夜福利小视频| 亚洲一区二区三区四区三级视频| 国产午夜亚洲精品久久| 久久99国内精品自在现线| 黄色一级片免费观看| 国产综合久久99久久| 成年丰满熟妇午夜免费视频| 国产黄色精品一区二区三区| 啪啪av一区二区三区| 老熟妇老熟女老女人天堂|